EP1272711A1 - Method and device for the production of back-cut cavities - Google Patents
Method and device for the production of back-cut cavitiesInfo
- Publication number
- EP1272711A1 EP1272711A1 EP01933596A EP01933596A EP1272711A1 EP 1272711 A1 EP1272711 A1 EP 1272711A1 EP 01933596 A EP01933596 A EP 01933596A EP 01933596 A EP01933596 A EP 01933596A EP 1272711 A1 EP1272711 A1 EP 1272711A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shaft
- elements
- hole
- producing
- working area
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 24
- 238000011010 flushing procedure Methods 0.000 claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 239000011796 hollow space material Substances 0.000 claims description 5
- 239000004566 building material Substances 0.000 claims description 4
- 239000004568 cement Substances 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims description 4
- 239000008267 milk Substances 0.000 claims description 3
- 210000004080 milk Anatomy 0.000 claims description 3
- 235000013336 milk Nutrition 0.000 claims description 3
- 239000010432 diamond Substances 0.000 claims 1
- 238000009412 basement excavation Methods 0.000 abstract 1
- 239000002689 soil Substances 0.000 description 7
- 238000002679 ablation Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
- E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/02—Retaining or protecting walls
- E02D29/0225—Retaining or protecting walls comprising retention means in the backfill
- E02D29/0233—Retaining or protecting walls comprising retention means in the backfill the retention means being anchors
Definitions
- the invention relates to a method for producing an undercut cavity, in particular for producing support members, the undercut cavity preferably acting to receive a load distribution element mounted therein. Furthermore, the invention relates to a device for producing such an undercut cavity.
- Load distribution cavity accumulated water and the soil dissolved in it is sucked off by means of a suction hose.
- An anchor hole in the ground is then rinsed out in the extension of the hole.
- a reinforcing bar (needle anchor) is then inserted through the hole, the reinforcing bar, for example, being a ribbed reinforcing steel.
- the reinforcement bar is held in the center of the anchor hole by means of a spacer and extends into the hole in the retaining wall to be fastened. Finally, it is preferably through another, which extends obliquely downwards into the load distribution cavity Filling hole cement material introduced, which completely fills the anchor hole, the load distribution cavity and the hole in the retaining wall.
- Composition is.
- the object of this invention is to provide a method for producing an undercut cavity, in particular for producing an earth anchor, which enables the production of a cavity with certain dimensions (within permissible tolerances) in a simple manner, and in which prevents the soil surrounding the cavity from softening. Furthermore, the invention is based on the object of creating a device for producing such an undercut cavity.
- a special device is used to produce an undercut cavity, which comprises a rotatable shaft which has at least one radially movable removal element in a predetermined area.
- the removal element is designed so that it rotates when the shaft rotates moved radially outward by the centrifugal forces acting on the removal element or exerting corresponding radial forces on the surrounding subsoil which remove or loosen the material of the subsoil.
- Removal element is to be understood to mean any configuration of the removal element which ensures that the rotation of the shaft as a result of the centrifugal forces tends to enlarge its radial dimensions.
- the removal element can consist of a rigid element which is arranged pivotably on the shaft, the pivot axis being arranged essentially perpendicular to the longitudinal axis.
- the essentially rigid removal element With its radially outer region, causing the material of the subsoil to be loosened or removed.
- the removal element is designed as a flexible element, preferably as a steel cable.
- the flexibility ensures that the rotatable shaft can be inserted into a borehole together with the removal elements.
- the diameter of the shaft in the area of the removal elements must be smaller than the inside diameter of the borehole, or recesses must be provided in the shaft in which the removal elements are received in the idle state.
- two flexible elements are each formed by a single element which is held in a bore provided transversely through the shaft. This results in a simplified manufacture of the device.
- areas or elements made of a resistant material can be provided on each removal element. These can be ring-shaped elements made of a resistant material, for example diamond-set rings, such as those used as chain links in stone saws
- the removal elements as such can be formed by steel cables that have sufficient flexibility.
- the steel cables can be dimensioned and attached to the shaft in such a way that the device is inserted into the shaft
- a plurality of removal elements, in particular flexible elements, of different lengths are preferably provided on the shaft.
- an improved ablating effect is achieved with an increase in the diameter of the undercut cavity that is created, since the ablating effect, in particular in the case of flexible ablating elements, is greatest when the ablating elements are in a substantially extended or almost extended position perpendicular to the longitudinal axis of the rotating shaft are located.
- a high ablation effect is thus ensured with different lengths of the ablation elements over a relatively large area of the diameter of the undercut cavity.
- an axially extending feed channel for feeding the flushing medium is in the shaft provided which has one or more outlet openings in the areas of fastening the removal elements.
- the device preferably has a guide area at the front end of the shaft, the outer diameter of which is essentially that
- an undercut cavity is created by the device, i.e. the shaft with the removal elements arranged thereon is introduced into a hole, the undercut
- Cavity is generated by a rotation of the shaft and the radial ablation or loosening forces generated thereby by means of the ablation elements.
- the removed or loosened material is rinsed out using a rinsing medium.
- a hardening building material for example cement milk or the like, is used as the rinsing medium. This also does not result in any unnecessary wetting of the substrate surrounding the borehole or the undercut cavity and, in addition, a high discharge effect is achieved due to the higher viscosity of such a flushing medium. A complete discharge of the loosened or removed material is at least not necessary if that
- Material in conjunction with the hardening building material is suitable for producing a sufficiently strong anchor body. It is also possible to use other equiped detergents.
- Fig. 1 shows a schematic section through a foundation body or a
- FIG. 2 shows an illustration similar to FIG. 1 in the phase of rotation of the device according to the invention for producing an undercut cavity
- Fig. 3 is an illustration similar to Fig. 1, the inventive
- FIGS. 1 to 3 shows a schematic illustration of the device according to the invention according to FIGS. 1 to 3.
- FIG. 1 shows schematically a section through a retaining wall 1 and a soil 3 lying behind it, which together, generally speaking, represent an underground 5.
- a borehole 7 was made, into which a device 9 for producing an undercut cavity is introduced in the phase of producing an undercut cavity shown in FIG. 1.
- the device 9 is explained in more detail below with reference to FIG. 4:
- the device 9 comprises a shaft 11 which has a head or guide area 13 in its front area, the outer diameter of which essentially corresponds to the inner diameter of the borehole 7. This results in the device 9 being centered in the borehole 7, although the rear region of the shaft 11 has a smaller outer diameter than the guide region 13.
- a plurality of removal elements 17 are arranged in a working area 15 of the shaft 11, of which only six elements are shown in FIG. 4.
- two removal elements 17 are each formed by a single element which extends through a bore perpendicular to the longitudinal axis of the shaft 11 and is held therein. This results in a simplified manufacture of the device 9.
- the removal elements 17 in FIG. 4 are designed as flexible removal elements, so that the device 9 can simply be inserted into the borehole due to the smaller diameter of the rear region of the shaft 11 compared to the inside diameter of the borehole 7.
- FIG. 1 shows the device 9 in two phases of the insertion process into the borehole 7: to the left of the longitudinal axis of the device 9, the phase is shown in which the device 9 is in a position in which the removal elements 17 are still completely outside of borehole 7.
- the removal elements 17 are shown stretched, whereby in practice the removal elements do not of course have to extend completely radially outwards in this phase, but may lie correspondingly curved due to their own weight.
- Half of the axis of symmetry of the device 9 is drawn in a position in which the
- Removal elements 17 were bent by the insertion movement into the borehole 7 in the direction of the rear end of the device 9. Usually, the removal elements 17 will have a certain prestress, so that at least the outer regions of the removal elements 17 rest against the inner wall of the borehole 7.
- the device 9 has already been completely inserted into the borehole 7, i.e. the working area 15 was pushed into the borehole until it is in an area in which the undercut cavity 19 is to be created.
- the device 9 is set in rotation, as indicated by the arrow I in FIG. 2, so that the removal elements are sufficient due to the centrifugal force exert high forces on the subsurface in the vicinity of the work area 15 in order to loosen or remove the material of the subsurface. As the diameter of the undercut cavity 19 increases, the removal elements 17 become more and more in an extended position.
- the device 9 can preferably be moved oscillating in the axial direction in order to produce an undercut hollow space 19 with a predetermined axial extent.
- the removed or loosened material of the surrounding subsurface is rinsed out of the annular space between the shaft 11 and the inner wall of the borehole 7 by means of a rinsing medium 21.
- Flushing medium 21 is provided, with several outlet openings 25 being provided in the work area 15.
- the outlet openings 25 are formed in the wall 27 of the 5 hollow shaft 11 such that the longitudinal axis of the outlet openings 25 in
- the flushing medium can be compressed air, water (at relatively low pressure) or a hardenable building material, e.g.
- the device 9 After completion of the undercut cavity 19, the device 9, as shown in FIG. 3, is pulled out of the borehole 7 or the undercut cavity 19 again.
- the flexible removal elements can e.g. be designed as steel cables.
- the steel cables can each have one or more elements 31 made of resistant
- the elements 31 made of resistant material can be ring-shaped elements which are pressed onto a stop element 17 designed as a steel cable.
- a stop element 17 designed as a steel cable.
- diamond-set links of a stone saw chain can be used.
- the removal elements 17 can be constructed from individual chain links, each or only certain of the chain elements being made of a resistant material with improved removal.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10017894A DE10017894A1 (en) | 2000-04-11 | 2000-04-11 | Method and device for producing undercut cavities, in particular for producing support members and nails |
DE10017894 | 2000-04-11 | ||
PCT/DE2001/001422 WO2001077445A1 (en) | 2000-04-11 | 2001-04-11 | Method and device for the production of back-cut cavities |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1272711A1 true EP1272711A1 (en) | 2003-01-08 |
EP1272711B1 EP1272711B1 (en) | 2004-03-03 |
Family
ID=7638305
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01933596A Expired - Lifetime EP1272711B1 (en) | 2000-04-11 | 2001-04-11 | Method and device for the production of back-cut cavities |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1272711B1 (en) |
AT (1) | ATE261026T1 (en) |
DE (2) | DE10017894A1 (en) |
WO (1) | WO2001077445A1 (en) |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3176772A (en) * | 1963-03-29 | 1965-04-06 | Macgregor Robert Roy | Device for removing detrital material from a liner, tubing and casing |
GB1249143A (en) * | 1968-12-13 | 1971-10-06 | Cementation Co Ltd | Improvements in or relating to a reamer bit |
GB1427528A (en) * | 1972-11-20 | 1976-03-10 | Reader Sons Ltd E | Device for making under-reams for ground anchors |
DD148247A1 (en) * | 1979-12-08 | 1981-05-13 | Willi Jahr | METHOD AND DEVICE FOR HOLLOW-MAKING A FUNDAMENTAL BODY |
DE3716100A1 (en) | 1987-05-14 | 1988-12-01 | Ross Kurt G | METHOD FOR SECURING SUPPORT WALLS |
DE3728270A1 (en) * | 1987-08-25 | 1989-06-01 | Klemm Bohrtech | Method and apparatus for constructing concrete piles in the ground |
DE3743507A1 (en) * | 1987-12-22 | 1989-07-06 | Klemm Bohrtech | Method and apparatus for producing piles in the earth |
CH691128A5 (en) * | 1995-10-23 | 2001-04-30 | Vincenzo Sibilla | A method of establishment of anchors. |
DE19721361C2 (en) * | 1997-05-22 | 2001-01-04 | Zueblin Ag | Method of making piles and piles made in this way |
US6065551A (en) * | 1998-04-17 | 2000-05-23 | G & G Gas, Inc. | Method and apparatus for rotary mining |
-
2000
- 2000-04-11 DE DE10017894A patent/DE10017894A1/en not_active Withdrawn
-
2001
- 2001-04-11 WO PCT/DE2001/001422 patent/WO2001077445A1/en active IP Right Grant
- 2001-04-11 EP EP01933596A patent/EP1272711B1/en not_active Expired - Lifetime
- 2001-04-11 AT AT01933596T patent/ATE261026T1/en active
- 2001-04-11 DE DE50101611T patent/DE50101611D1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO0177445A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE50101611D1 (en) | 2004-04-08 |
WO2001077445A1 (en) | 2001-10-18 |
ATE261026T1 (en) | 2004-03-15 |
EP1272711B1 (en) | 2004-03-03 |
DE10017894A1 (en) | 2001-10-25 |
WO2001077445B1 (en) | 2002-05-23 |
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